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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 128 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.59² =
  2. 2.49² =
  3. 3.49² =
  4. 4.71² =
  5. 5.69² =
  6. 6.19² =
  7. 7.79² =
  8. 8.29² =
  9. 9.51² =
  10. 10.61² =
  11. 11.61² =
  12. 12.51² =
  13. 13.21² =
  14. 14.39² =
  15. 15.19² =
  16. 16.29² =
  17. 17.41² =
  18. 18.49² =
  19. 19.81² =
  20. 20.59² =
  21. 21.89² =
  22. 22.69² =
  23. 23.51² =
  24. 24.91² =
  25. 25.39² =
  26. 26.29² =
  27. 27.39² =
  28. 28.79² =
  29. 29.31² =
  30. 30.81² =
  31. 31.81² =
  32. 32.69² =
  33. 33.61² =
  34. 34.79² =
  35. 35.21² =
  36. 36.41² =
  37. 37.29² =
  38. 38.21² =
  39. 39.61² =
  40. 40.29² =

Answer key

  1. 3481
  2. 2401
  3. 2401
  4. 5041
  5. 4761
  6. 361
  7. 6241
  8. 841
  9. 2601
  10. 3721
  11. 3721
  12. 2601
  13. 441
  14. 1521
  15. 361
  16. 841
  17. 1681
  18. 2401
  19. 6561
  20. 3481
  21. 7921
  22. 4761
  23. 2601
  24. 8281
  25. 1521
  26. 841
  27. 1521
  28. 6241
  29. 961
  30. 6561
  31. 6561
  32. 4761
  33. 3721
  34. 6241
  35. 441
  36. 1681
  37. 841
  38. 441
  39. 3721
  40. 841

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